BENEDICTINE UNIVERSITY

Calculator note--some calculators, notably TI's, compute two standard deviations. The smaller of the two is the one we call "ssd" ... Addition rule to compute unions: P(AuB) = P(A) + P(B) - P(AnB) The deduction of P(AnB) eliminates the double counting that occurs when P(A) is added to P(B). ................
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